Examples of video encoding methods and apparatus and video decoding methods and apparatus are described. An example method of video processing includes performing a conversion between a video and a bitstream of the video according to a rule. At least one of the one or more parameter sets of the bitstream includes a general syntax structure including timing and hypothetical reference decoder (HRD) parameters. The rule specifies that a first syntax flag is not included in the general syntax structure in response to (1) a second syntax flag specifying that network abstraction layer (NAL) HRD parameters are not present in the general syntax structure, and (2) a third syntax flag specifying that video coding layer (VCL) HRD parameters are not present in the general syntax structure, where the first syntax flag specifies that same picture-level timing information applies to all output layer sets in the bitstream.
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2. The method of claim 1, wherein the second syntax flag is represented as general_nal_hrd_params_present_flag.
3. The method of claim 1, wherein the third syntax flag is represented as general_vcl_hrd_params_present_flag.
4. The method of claim 1, wherein the one or more parameter sets comprise a video parameter set.
5. The method of claim 1, wherein the one or more parameter sets comprise a sequence parameter set.
6. The method of claim 1, wherein the conversion comprises encoding the video into the bitstream.
7. The method of claim 1, wherein the conversion comprises decoding the video from the bitstream.
9. The apparatus of claim 8, wherein the second syntax flag is represented as general_nal_hrd_params_present_flag.
10. The apparatus of claim 8, wherein the third syntax flag is represented as general_vcl_hrd_params_present_flag.
11. The apparatus of claim 8, wherein the one or more parameter sets comprise a video parameter set.
12. The apparatus of claim 8, wherein the one or more parameter sets comprise a sequence parameter set.
14. The non-transitory computer-readable storage medium of claim 13, wherein the second syntax flag is represented as general_nal_hrd_params_present_flag.
15. The non-transitory computer-readable storage medium of claim 13, wherein the third syntax flag is represented as general_vcl_hrd_params_present_flag.
16. The non-transitory computer-readable storage medium of claim 13, wherein the one or more parameter sets comprise a video parameter set or a sequence parameter set.
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November 18, 2022
August 27, 2024
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